TCA9555: TCA9555 Input Signal

Hey Kevin,

Regarding this:

"My customer wants to use SMBUS for reading and write on below signal:

Present signal

GPIO signal

Alert signal"

Do you mean they are going to be programming the device's present configuration (either input or output), output state (high or low), and seeing an INT and reading the input pins?

Our device is compatible with the SMBUS so this should not be an issue if this was what you mean.

"Is there anything(speed or anything ) need to be careful for this kind of application?"

I don't have any information on what the end equipment is and where it will be used. Example would be if you care about power consumption in something like a personal electric wearable then you should not leave any inputs floating.

Other than that, I would say to try to keep the SDA/SCL traces on the PCB somewhat distanced from each other to avoid cross talk.

-Bobby